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https://issues.apache.org/jira/browse/SPARK-26735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-26735:
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Assignee: Apache Spark
> Verify plan integrity for special expressions
> ---------------------------------------------
>
> Key: SPARK-26735
> URL: https://issues.apache.org/jira/browse/SPARK-26735
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Kris Mok
> Assignee: Apache Spark
> Priority: Major
>
> Add verification of plan integrity with regards to special expressions being
> hosted only in supported operators. Specifically:
> * AggregateExpression: should only be hosted in Aggregate, or indirectly in
> Window
> * WindowExpression: should only be hosted in Window
> * Generator: should only be hosted in Generate
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